Hi all,
I am concerned about one of my Panda Cory's that went from normal to skittish to very low activity in a short amount of time. Out of the 6 Cory's this one has always been a bit of a loner but has still joined meals w/o issue and has been rooting around independently. They don't raise their dorsal fin anymore and even seem a bit off center. I cannot see anything externally visibly wrong with them.
Temp - 73-75 °F
pH - 7.2-7.4
Ammonia/Nitrites/Nitrates - 0/0/>5ppm
Water maintenance - Weekly 25% changes / Filters have significant capacity
Other parameters - Softened Well water that I refilter through carbon. No iron, copper, lead, h. sulfide, manganese, mercury, zinc, or fluoride. 0 Sodium Chloride, >20ppm Sodium ions. Low total Alkalinity. Tank TDS is about 300.
I have 5 other pandas and a mystery snail that could not be happier. Or at least are currently unbothered and thriving.
I have not quarantined the cory, nor treated the tank with any medication as of yet.
Events of note, I had a blue-green algae wave that was affecting my tank about a month ago but has since been treated and vanquished by blue-green slime remover. This did not seem to affect any of the other tank mates including the Mystery snail in any negative way but it is the only major change I have done to the tank.
Any advise on next steps to help them is greatly appreciated.
